Japanese elderly cohort in Okinawa, Japan: exploring the relationship of social factors and health.
D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D015331:Cohort Studies; D006304:Health Status; D006801:Humans; D007398:Interpersonal Relations; D007564:Japan; D008136:Longevity; D008137:Longitudinal Studies; D008603:Mental Health; D017678:Sex Distribution; D012890:Sleep; D012959:Socioeconomic Factors